9998=VERT_CS["Custom height",VERT_DATUM["Custom vertical datum", 2000, AUTHORITY["EPSG","1261"]],AXIS["gravity-related height (H)",up],UNIT["m",1.0],AUTHORITY["EPSG","9998"]]
9999=VERT_CS["Custom height",VERT_DATUM["Custom vertical datum", 2000, AUTHORITY["EPSG","1261"]],AXIS["gravity-related height (H)",up],UNIT["m",1.0],AUTHORITY["EPSG","9999"]]
